Remind Users to fill-out info
Perhaps to help alleviate the raft of otherwise-blank profiles, it would be nice if Grommr had the ability to 'nudge' a user to add details about their profile shortly after registration - say, within seven days.
It could start small, like "We noticed you haven't listed any favorite movies - perhaps you'd like to share a few now?"
Facebook, if I recall, does (or did) something similar - and would even go as far as recommend friends based on mutual interest(s).
It would help encourage participation from users if they added details like this.
Even a little bit of information, not necessarily even a picture, could go a good ways to open doors for new users (or perhaps incredibly shy ones) from connecting with others.
It won't eliminate blank-slate profiles, ever, but at least a user who participates a little/lot can draw better conclusions as to how much interests they share with another.